CN109435768A - Battery equalization method, system, vehicle, storage medium and electronic equipment - Google Patents

Battery equalization method, system, vehicle, storage medium and electronic equipment Download PDF

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Publication number
CN109435768A
CN109435768A CN201710773468.8A CN201710773468A CN109435768A CN 109435768 A CN109435768 A CN 109435768A CN 201710773468 A CN201710773468 A CN 201710773468A CN 109435768 A CN109435768 A CN 109435768A
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CN
China
Prior art keywords
battery
voltage change
balanced
change ratio
voltage
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Pending
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CN201710773468.8A
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Chinese (zh)
Inventor
罗红斌
王超
沈晓峰
曾求勇
刘苑红
张祥
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BYD Co Ltd
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BYD Co Ltd
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Priority to CN201710773468.8A priority Critical patent/CN109435768A/en
Publication of CN109435768A publication Critical patent/CN109435768A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0019Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries

Abstract

This disclosure relates to a kind of battery equalization method, system, vehicle, storage medium and electronic equipment, which comprises obtain the voltage change ratio of each single battery in battery pack;According to the voltage change ratio of single battery each in the battery pack, reference voltage change rate needed for determining balanced judgement;According to the voltage change ratio of at least one single battery and the reference voltage change rate, determines and need balanced single battery.It determines according to the voltage change ratio of at least one single battery in battery pack using this method and needs balanced single battery.It is no longer fixedly determined according to SOC value or load voltage values and needs balanced single battery, using the voltage change ratio of single battery as battery information based on the single battery for determining needs equilibrium, battery information based on enriching the single battery for determining and needing equilibrium provides the diversified determining method for needing balanced single battery.

Description

Battery equalization method, system, vehicle, storage medium and electronic equipment
Technical field
This disclosure relates to control technology field, and in particular, to a kind of battery equalization method, system, vehicle, storage medium And electronic equipment.
Background technique
The large-capacity battery for providing power source for electric car is commonly referred to as power battery.Vehicular dynamic battery generally by Multiple single batteries are composed in series a module.With the use of battery, the otherness between each single battery is gradually expanded, monomer Consistency is poor between battery, and due to the short -board effect of battery, battery capacity performance is restricted, and prevents battery capacity from abundant It plays, the whole capacity of battery pack is caused to reduce.On the other hand, it after the otherness between each single battery is gradually expanded, will make At certain single battery overcharges, certain single battery overdischarge influence battery life, damage battery, but also there may be A large amount of heat causes cells burst or explosion.
Therefore, effective balanced management is carried out to electric automobile power battery, is conducive to improve each battery in battery pack Consistency reduces the capacitance loss of battery, extends the service life and electric car continual mileage of battery, has highly important Meaning.
Currently, carrying out balanced management to power battery pack, first have to determine to need from power battery pack to carry out balanced Single battery, it is therefore desirable to the battery information of single battery each in power battery pack is acquired in real time, then basis Battery information (such as: SOC value, load voltage values) come determine which single battery need to carry out it is balanced, and then to needing equilibrium Single battery carry out it is balanced.Need battery information based on balanced single battery more single as it can be seen that determining.
Summary of the invention
Purpose of this disclosure is to provide a kind of battery equalization method, system, vehicle, storage medium and electronic equipments, with excellent Electrochemical cell balancing procedure.
To achieve the goals above, disclosure first aspect provides a kind of battery equalization method, which comprises
Obtain the voltage change ratio of each single battery in battery pack;
According to the voltage change ratio of single battery each in the battery pack, reference voltage needed for determining balanced judgement becomes Rate;
According to the voltage change ratio of at least one single battery and the reference voltage change rate, determines and need balanced list Body battery.
Optionally, the voltage change ratio and the reference voltage change rate according at least one single battery determines Need balanced single battery, comprising:
Determine that the voltage between the voltage change ratio and the reference voltage change rate of at least one single battery becomes Rate difference;
Obtain balanced unlatching threshold value;
Voltage change ratio difference at least one described single battery is greater than or equal to the balanced list for opening threshold value Body battery is determined as needing balanced single battery.
Optionally, the voltage change ratio according to single battery each in the battery pack determines needed for balanced judgement Reference voltage change rate, comprising:
Minimum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage to become Rate;
Electricity between the voltage change ratio of at least one single battery described in the determination and the reference voltage change rate Buckling rate difference, comprising:
Determine the voltage change ratio difference between the voltage change ratio of following single battery and the reference voltage change rate:
The maximum single battery of voltage change ratio in the battery pack;Or
Other monomers battery in the battery pack in addition to voltage change ratio is the single battery of the minimum value.
Optionally, voltage change ratio difference at least one described single battery is being greater than or equal to the balanced unlatching The single battery of threshold value is determined as after needing balanced single battery, the method also includes:
When the battery pack is in charging process, voltage change ratio difference at least one described single battery is controlled More than or equal to the balanced single battery electric discharge for opening threshold value;
When the battery pack is in discharge process, voltage change ratio difference at least one described single battery is controlled More than or equal to the balanced single battery charging for opening threshold value.
Optionally, the voltage change ratio according to single battery each in the battery pack determines needed for balanced judgement Reference voltage change rate, comprising:
Maximum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage to become Rate;
Electricity between the voltage change ratio of at least one single battery described in the determination and the reference voltage change rate Buckling rate difference, comprising:
Determine the voltage change ratio difference between the voltage change ratio of following single battery and the reference voltage change rate:
The smallest single battery of voltage change ratio in the battery pack;Or
Other monomers battery in the battery pack in addition to voltage change ratio is the single battery of the maximum value.
Optionally, voltage change ratio difference at least one described single battery is being greater than or equal to the balanced unlatching The single battery of threshold value is determined as after needing balanced single battery, the method also includes:
When the battery pack is in charging process, voltage change ratio difference at least one described single battery is controlled More than or equal to the balanced single battery charging for opening threshold value;
When the battery pack is in discharge process, voltage change ratio difference at least one described single battery is controlled More than or equal to the balanced single battery electric discharge for opening threshold value.
Optionally, the voltage change ratio according to single battery each in the battery pack determines needed for balanced judgement Reference voltage change rate, comprising:
The average value of the voltage change ratio of single battery each in the battery pack is determined as the reference voltage variation Rate;
Electricity between the voltage change ratio of at least one single battery described in the determination and the reference voltage change rate Buckling rate difference, comprising:
Determine the electricity in the battery pack between the voltage change ratio of each single battery and the reference voltage change rate Buckling rate difference.
Optionally, voltage change ratio difference at least one described single battery is being greater than or equal to the balanced unlatching The single battery of threshold value is determined as after needing balanced single battery, the method also includes:
When the battery pack is in charging process, it is small to control voltage change ratio in the single battery for needing equilibrium It charges in the single battery of the average value, and controls voltage change ratio in the single battery for needing equilibrium and be greater than described put down The single battery of mean value discharges;
When the battery pack is in discharge process, it is small to control voltage change ratio in the single battery for needing equilibrium It discharges in the single battery of the average value, and controls voltage change ratio in the single battery for needing equilibrium and be greater than described put down The single battery of mean value charges.
Optionally, in the voltage change ratio according at least one single battery and the reference voltage change rate, really After the fixed single battery for needing equilibrium, the method also includes:
According to the voltage change ratio and the reference voltage change rate for needing balanced single battery, determine described in Need the target equilibrium duration of balanced single battery;
According to the target equilibrium duration for needing balanced single battery, the single battery for needing equilibrium is controlled It is balanced.
Optionally, the voltage change ratio for obtaining each single battery in battery pack, comprising:
Unit quantity of electricity is filled with or released to each single battery in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the negative of the single battery Carry the variable quantity that voltage value is generated with unit quantity of electricity described in electric quantity change.
Optionally, the voltage change ratio for obtaining each single battery in battery pack, comprising:
To single battery charge or discharge unit time each in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the electricity of the single battery Pressure value is with the variable quantity generated to unit time described in the single battery charge/discharge.
Disclosure second aspect provides a kind of battery equalization system, comprising: balance module, acquisition module and control mould Block,
The acquisition module is used to obtain the voltage change ratio of each single battery in battery pack;
The control module is used for the voltage change ratio according to single battery each in the battery pack, determines balanced judgement Required reference voltage change rate, and, changed according to the voltage change ratio of at least one single battery and the reference voltage Rate determines and needs balanced single battery;
The balance module is used to need balanced single battery to carry out equilibrium to described.
Optionally, the control module is used for:
Determine that the voltage between the voltage change ratio and the reference voltage change rate of at least one single battery becomes Rate difference;
Obtain balanced unlatching threshold value;
Voltage change ratio difference at least one described single battery is greater than or equal to the balanced list for opening threshold value Body battery is determined as needing balanced single battery.
Optionally, the control module is used for:
Minimum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage to become Rate;Or
Maximum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage to become Rate;Or
The average value of the voltage change ratio of single battery each in the battery pack is determined as the reference voltage variation Rate.
Optionally, the control module is used for:
According to the voltage change ratio and the reference voltage change rate for needing balanced single battery, determine described in Need the target equilibrium duration of balanced single battery;
The balance module is used for:
According to the target equilibrium duration for needing balanced single battery, balanced single battery is needed to carry out to described It is balanced.
Optionally, the control module is used for:
Unit quantity of electricity is filled with or released to each single battery in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the negative of the single battery Carry the variable quantity that voltage value is generated with unit quantity of electricity described in electric quantity change.
Optionally, the control module is used for:
To single battery charge or discharge unit time each in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the electricity of the single battery Pressure value is with the variable quantity generated to unit time described in the single battery charge/discharge.
Optionally, the control module passes through a channel and the acquisition module and equilibrium model that correspond to same single battery Block connection, the control module are used for the control when determination does not need to carry out balanced with the single battery that the control module connects The control module is connected with corresponding sampling module;Alternatively,
The control module is also used to the control when the single battery determined with the control module connects needs progress balanced The control module is connected in first time with corresponding sampling module, is connected in the second time with corresponding balance module.
Optionally, the control module include control chip, the control chip by a pin and it is one lead to Road is connect with the acquisition module and balance module for corresponding to same single battery.
Optionally, the control module by two channels respectively with the acquisition module that corresponds to same single battery and equal The module that weighs connection.
Optionally, the control module include control chip, the control chip pass through two pins respectively with correspond to The acquisition module of same single battery is connected with balance module, and described two pins and described two channels correspond.
The disclosure third aspect provides a kind of computer readable storage medium, is stored thereon with computer program instructions, should Method described in disclosure first aspect is realized when program instruction is executed by processor.
Disclosure fourth aspect provides a kind of electronic equipment, comprising:
Computer readable storage medium described in the disclosure third aspect;And
One or more processor, for executing the program in the computer readable storage medium.
The 5th aspect of the disclosure provides a kind of vehicle, and the vehicle includes: described in battery pack and disclosure fourth aspect Battery equalization system.
Through the above technical solutions, determining and needing according to the voltage change ratio of at least one single battery in battery pack The single battery of weighing apparatus.It is no longer fixedly determined according to SOC value or load voltage values and needs balanced single battery, by single battery Voltage change ratio as determine need balanced single battery based on battery information, enrich and determine and need balanced list Battery information based on body battery provides the diversified determining method for needing balanced single battery.
Other feature and advantage of the disclosure will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is the schematic diagram of the battery equalization system of one embodiment of the disclosure;
Fig. 2 is the signal that two single batteries of one embodiment of the disclosure share the battery equalization system of a balance module Figure;
Fig. 3 is the schematic diagram of the battery equalization system of another embodiment of the disclosure;
Fig. 4 is that two single batteries of another embodiment of the disclosure share showing for the battery equalization system of a balance module It is intended to;
Fig. 5 is the flow diagram of the battery equalization method of one embodiment of the disclosure;
Fig. 6 is the voltage difference schematic diagram of the single battery and reference battery to be equalized of one embodiment of the disclosure;
Fig. 7 is the voltage difference schematic diagram of the single battery and reference battery to be equalized of another embodiment of the disclosure;
Fig. 8 is the open-circuit voltage OCV- remaining capacity SOC curve of the single battery of one embodiment of the disclosure;
Fig. 9 is the schematic diagram of the internal resistance of cell model of one embodiment of the disclosure;
Figure 10 is the schematic diagram of the balance module of one embodiment of the disclosure.
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
It is the schematic diagram of the battery equalization system of one embodiment of the disclosure referring to Fig. 1.The battery equalization system includes: control Molding block 101, acquisition module 102, balance module 103 and battery pack 104.
In one embodiment, all corresponding acquisition module 102 of every section single battery and a balance module 103.It is right Different control channel and control module 101 should be passed through respectively in the acquisition module 102 and balance module 103 of same single battery Connection.Control module may include control chip, control chip by two pins respectively with correspond to same single battery and adopting Collection module is connected with balance module, and two pins and two channels correspond.
In this embodiment, control module 101 controls acquisition module 102 and 103 timesharing of balance module according to unit period Conducting carries out the acquisition of battery information and the equilibrium of battery respectively, so that battery information acquisition and balanced timesharing carry out.Avoid electricity When pond information collection and equilibrium carry out simultaneously, the influence for the precision that euqalizing current acquires battery information.
In one embodiment, shown in Figure 1, each single battery in battery respectively with an acquisition module 102 and The connection of one balance module 103.If battery pack includes N number of single battery, acquisition module 102 be it is N number of, balance module 103 is N It is a, as a result, control module 101 by 2 × N number of control channel, connect respectively with N number of acquisition module and N number of balance module.
In further embodiments, different single batteries can share balance module, for example, N number of monomer in battery pack Battery, can share the same balance module or every preset quantity (for example, 2,3 or 5 etc.) a single battery shares one Balance module etc..When thering are at least two section single batteries to need balanced in the more piece single battery for sharing a balance module, In the balancing period of unit period, every section single battery in the balance module at least two section single batteries balanced with needs is handed over For connection.
Referring to fig. 2, two single batteries share a balance module, when the two section single batteries for sharing a balance module When being required to equilibrium, in the balancing period of unit period, which replaces connection with every section single battery.Alternately connect It can be the connection according to certain period alternately.111 institute of a single battery for example, with reference to Fig. 2, in two section single batteries When paralleling switch 150 in corresponding parallel branch 15 is closed 2s under the control of control module 14, in two section single batteries Paralleling switch 150 in parallel branch 15 corresponding to another single battery 111 disconnects 2s under the control of control module 14. That is the paralleling switch 150 in the corresponding parallel branch 15 of each single battery 111 in two section single batteries, in balancing period It is interior, it just was switched to off-state from closed state every two seconds, or be switched to closed state from off-state.It is adopting as a result, On the basis of collecting module and balance module timesharing conducting, in balancing period, the single battery alternating of same balance module is shared Connect with the shared balance module, realize balanced.
It is the structural schematic diagram of the battery equalization system of another embodiment of the disclosure referring to Fig. 3.
The battery equalization system includes: control module 301, acquisition module 302, balance module 303 and battery pack 304.Its In, battery pack 304 includes multiple concatenated single batteries.Control module 301 by control channel 305 with corresponding to same The acquisition module 302 and balance module 303 of single battery connect.Control module is used to determine the list connecting with the control module When body battery does not need to carry out equilibrium, control control module is connected with corresponding sampling module;Alternatively, control module is also used to Determine that acquisition module and balance module are according to unit period point when needing progress balanced with the single battery that the control module connects When multiplex channel 305.
One unit period includes: acquisition period and balancing period.Control module 301 controls acquisition module 302, is acquiring The battery information of single battery is sampled in period, to obtain the battery information of single battery.Battery information includes at least One of: voltage, electric current and temperature etc..In one embodiment, battery information can only include voltage value, as a result, The voltage performance parameter of single battery can be obtained.In another embodiment, battery information can also include voltage value, electric current simultaneously Value and temperature value etc., can be obtained the performance parameters such as SOC, internal resistance, the voltage change ratio of single battery as a result,.
Control module 301 determines according to the battery information for the single battery that acquisition module 302 acquires and needs to carry out equilibrium Single battery to be equalized.For needing to open balanced single battery to be equalized, the control of control module 301 and the list to be equalized The corresponding balance module of body battery carries out the single battery to be equalized balanced in balancing period.
As a result, in the embodiments of the present disclosure, the same control channel, control module are shared between acquisition module and balance module Acquisition module and balance module are controlled, according to the unit period time-sharing multiplex control channel, avoids battery information acquisition and When weighing while carrying out, the influence for the precision that euqalizing current acquires battery information;On the other hand, shown in FIG. 1 compared to above-mentioned Embodiment reduces the number of channels requirement to control module chip, can save hardware cost.
In one embodiment, in the shared control channel of acquisition module and balance module, it is provided with a switch K, is controlled Molding block 301 is connect with switch K, and by control switch K, realizes that timesharing is connect with acquisition module 302 or balance module 303. When switch K is connect with acquisition module 302, control module 301 controls acquisition module 302, in collection period, to single battery Carry out the acquisition of battery information;When switch K is connect with balance module 303, control module 301 controls 303 pairs of institutes of balance module Corresponding single battery carries out balanced.
In one embodiment, shown in Figure 1, each single battery in battery respectively with an acquisition module 302 and The connection of one balance module 303.If battery pack includes N number of single battery, acquisition module 302 be it is N number of, balance module 303 is N A, control module 301 is connect with acquisition module and balance module respectively by N number of control channel as a result,.
In further embodiments, different single batteries can share balance module, for example, N number of monomer in battery pack Battery, can share the same balance module or every preset quantity (for example, 2,3 or 5 etc.) a single battery shares one Balance module etc..When thering are at least two section single batteries to need balanced in the more piece single battery for sharing a balance module, In the balancing period of unit period, every section single battery in the balance module at least two section single batteries balanced with needs is handed over For connection.
Referring to fig. 4, an illustrative diagram of a balance module is shared for two single batteries.When a shared equilibrium When two section single batteries of module are required to equilibrium, in the balancing period of unit period, the balance module and every section monomer electricity Pond alternately connects.Alternately connection can be the connection according to certain period alternately.As a result, in acquisition module and balance module point When conducting on the basis of, in balancing period, share the single battery of the same balance module alternately equilibrium model shared with this Block connection is realized balanced.
In one embodiment, acquisition module can be voltage acquisition chip, for acquiring the period, to the electricity of single battery Pressure is acquired.
Referring to Fig. 5, based on battery equalization system shown in above-mentioned Fig. 1, Fig. 2, Fig. 3 or Fig. 4 any embodiment, the disclosure one The battery equalization method of embodiment includes:
In step s 51, the voltage change ratio of each single battery in battery pack is obtained;
In step S52, according to the voltage change ratio of single battery each in the battery pack, determine needed for balanced judgement Reference voltage change rate;
In step S53, according to the voltage change ratio of at least one single battery and the reference voltage change rate, determine Need balanced single battery.
Wherein, the electricity when voltage change ratio of single battery can be the specified physical quantity generation Unit alteration of single battery Press variable quantity.For example, default electricity, the voltage variety (dv/ of single battery are filled with or released to single battery in the disclosure dq);Or charge or discharge preset duration is carried out to single battery, it is carried out for the voltage variety (dv/dt) of single battery Explanation.
In one embodiment, above-mentioned steps S51 has and is not limited to following two embodiment:
The first embodiment: unit quantity of electricity is filled with or released to each single battery in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the negative of the single battery Carry the variable quantity that voltage value is generated with unit quantity of electricity described in electric quantity change.
Second of embodiment: to each single battery charge or discharge unit time in the battery pack;To the electricity The each single battery of Chi Zuzhong, the voltage variety for determining the single battery are the voltage value of the single battery with electric to the monomer Unit time described in the charge/discharge of pond and the variable quantity generated.
In one embodiment, the voltage change ratio of each single battery includes: in acquisition battery pack
During the charge or discharge of battery pack, determines and be filled with or release default electricity, each monomer to each single battery The voltage variety of battery.Voltage variety be to single battery be filled with or release preset electricity before initial end voltage and to list Body battery is filled with or releases the difference of the most terminal voltage after default electricity.
To single battery each in battery pack, determine that the voltage change ratio of the single battery is the voltage change of the single battery The ratio of change amount and default electricity.
In another embodiment, the voltage change ratio of each single battery includes: in acquisition battery pack
During the charge or discharge of battery pack, determine to each single battery charge or discharge preset duration, each monomer The voltage variety of battery.Voltage variety be to single battery be filled with or release preset electricity before initial end voltage and to list Body battery is filled with or releases the difference of the most terminal voltage after default electricity;
To single battery each in battery pack, determine that the voltage change ratio of the single battery is the voltage change of the single battery The ratio of change amount and preset duration.
During the charge or discharge of battery pack, the voltage and electric quantity change situation of single battery are recorded, thus, it is possible to According to voltage and electric quantity change situation, the voltage change ratio of single battery is got according to the method described above.
In step S52, according to the voltage change ratio of each single battery, reference voltage change rate is determined.
In one embodiment, the voltage change ratio of any of battery pack single battery can be changed as the reference voltage Rate, such as by the voltage change ratio of Section 2 single battery in battery pack change rate as the reference voltage, or, electric in battery pack The voltage change ratio of the maximum single battery of buckling rate, or, in battery pack the smallest single battery of voltage change ratio voltage Change rate, or, the voltage change ratio that voltage change ratio comes the single battery of middle in battery pack (includes surprise for battery pack The case where several single batteries).
In another embodiment, reference voltage change rate is also possible to the voltage according to single battery each in battery pack What change rate was calculated, such as: the average value of the voltage change ratio of each single battery in the group of pond, or, voltage in battery pack The average value that change rate comes the voltage change ratio of two most intermediate single batteries (includes even number monomer electricity for battery pack The case where pond).
Optionally, step S53 includes:
Determine that the voltage between the voltage change ratio and the reference voltage change rate of at least one single battery becomes Rate difference;
Obtain balanced unlatching threshold value;
Voltage change ratio difference at least one described single battery is greater than or equal to the balanced list for opening threshold value Body battery is determined as needing balanced single battery.
Wherein, balanced threshold value of opening is for determining whether to open any of battery pack single battery balanced threshold Value, namely for judging whether any of battery pack single battery is the threshold value for needing balanced single battery.
Firstly, at least one single battery is chosen from battery pack, then by least one selected single battery Voltage change ratio makes the difference with reference voltage change rate, obtains the voltage change ratio difference of at least one selected single battery. Then obtained voltage change ratio difference is opened threshold value with equilibrium to compare, if the voltage change ratio of a single battery is poor Value is greater than or equal to balanced unlatching threshold value, then the battery is to need balanced single battery;If the voltage of a single battery Change rate difference is less than balanced unlatching threshold value, then the battery is not need balanced single battery.
Reference voltage change rate is different, at least one selected single battery is different, to the single battery for needing equilibrium It is different to carry out balanced process.Below in the voltage change ratio to reference voltage change rate for each single battery in battery pack It the case where minimum value, maximum value and average value, is illustrated respectively.
1) the case where reference voltage change rate is the minimum value in battery pack in the voltage change ratio of each single battery Under, between the voltage change ratio of at least one single battery described in the determination and reference voltage change rate needed for balanced judgement Voltage change ratio difference, comprising: determine that the voltage change ratio of following single battery becomes with reference voltage needed for balanced judgement Voltage change ratio difference between rate:
The maximum single battery of voltage change ratio in the battery pack;Or
Other monomers battery in the battery pack in addition to voltage change ratio is the single battery of the minimum value.
Correspondingly, determining that needing balanced single battery is voltage change ratio difference at least one described single battery After the balanced single battery for opening threshold value, the method also includes: when the battery pack is in charging When in the process, controls voltage change ratio difference at least one described single battery and be greater than or equal to the balanced unlatching threshold value Single battery electric discharge;When the battery pack is in discharge process, voltage change at least one described single battery is controlled Rate difference is greater than or equal to the balanced single battery charging for opening threshold value.
It specifically, is the minimum value in battery pack in the voltage change ratio of each single battery in reference voltage change rate In the case of, only the voltage change ratio of the maximum single battery of voltage change ratio in battery pack can be done with reference voltage change rate Difference, and then judge whether the maximum single battery of voltage change ratio is to need balanced single battery in battery pack.Such implementation Mode is only capable of judging whether a single battery needs equilibrium.
In the case where reference voltage change rate is the minimum value in battery pack in the voltage change ratio of each single battery, It can also be by the voltage change ratio of the other monomers battery in battery pack in addition to the smallest single battery of voltage change ratio, with ginseng It examines voltage change ratio to make the difference, and then judges the electricity of the other monomers in battery pack in addition to the smallest single battery of voltage change ratio Pond, if be to need balanced single battery.Such embodiment is a kind of mode of batch judgement, can disposably judge electricity Other monomers battery of the Chi Zuzhong in addition to the smallest single battery of voltage change ratio, if be to need balanced single battery.
In the case where reference voltage change rate is the minimum value in battery pack in the voltage change ratio of each single battery, It is to needing balanced single battery to carry out balanced process:
In view of voltage change ratio is big, on the one hand may as the internal resistance of cell it is big caused by.It on the other hand may be presence Caused by capacity volume variance, that is, SOC initial difference.Wherein, the big battery of internal resistance, aging is serious, during the charging process, on voltage It rises fastly, therefore, when battery pack is in charging process, discharges the single battery for needing equilibrium;In view of the big electricity of internal resistance Pond, aging is serious, and during discharge, voltage decline is fast, therefore, when the battery pack is in discharge process, to need Want balanced single battery charging.
2) the case where reference voltage change rate is the maximum value in battery pack in the voltage change ratio of each single battery Under, between the voltage change ratio of at least one single battery described in the determination and reference voltage change rate needed for balanced judgement Voltage change ratio difference, comprising: determine that the voltage change ratio of following single battery becomes with reference voltage needed for balanced judgement Voltage change ratio difference between rate:
The smallest single battery of voltage change ratio in the battery pack;Or
Other monomers battery in the battery pack in addition to voltage change ratio is the single battery of the maximum value.
Correspondingly, determining that needing balanced single battery is voltage change ratio difference at least one described single battery After the balanced single battery for opening threshold value, the method also includes: when the battery pack is in charging When in the process, controls voltage change ratio difference at least one described single battery and be greater than or equal to the balanced unlatching threshold value Single battery charging;When the battery pack is in discharge process, voltage change at least one described single battery is controlled Rate difference is greater than or equal to the balanced single battery electric discharge for opening threshold value.
It specifically, is the maximum value in battery pack in the voltage change ratio of each single battery in reference voltage change rate In the case of, only the voltage change ratio of the smallest single battery of voltage change ratio in battery pack can be done with reference voltage change rate Difference, and then judge whether the smallest single battery of voltage change ratio is to need balanced single battery in battery pack.Such implementation Mode is only capable of judging whether a single battery needs equilibrium.
In the case where reference voltage change rate is the maximum value in battery pack in the voltage change ratio of each single battery, It can also be by the voltage change ratio of the other monomers battery in battery pack in addition to the maximum single battery of voltage change ratio, with ginseng It examines voltage change ratio to make the difference, and then judges the electricity of the other monomers in battery pack in addition to the maximum single battery of voltage change ratio Pond, if be to need balanced single battery.Such embodiment is a kind of mode of batch judgement, can disposably judge electricity Other monomers battery of the Chi Zuzhong in addition to the maximum single battery of voltage change ratio, if be to need balanced single battery.
In the case where reference voltage change rate is the maximum value in battery pack in the voltage change ratio of each single battery, It is to needing balanced single battery to carry out balanced process:
In view of voltage change ratio is big, on the one hand may as the internal resistance of cell it is big caused by.It on the other hand may be presence Caused by capacity volume variance, that is, SOC initial difference.Wherein, the big battery of internal resistance, aging is serious, during the charging process, on voltage It rises fastly, therefore, when battery pack is in charging process, charges to the single battery for needing equilibrium;In view of the big electricity of internal resistance Pond, aging is serious, and during discharge, voltage decline is fast, therefore, when the battery pack is in discharge process, to need Want balanced single battery electric discharge.
3) in the case where reference voltage change rate is the average value of the voltage change ratio of each single battery in battery pack, Between the voltage change ratio of at least one single battery described in the determination and reference voltage change rate needed for balanced judgement Voltage change ratio difference, comprising: determine that the voltage change ratio of each single battery and the reference voltage become in the battery pack Voltage change ratio difference between rate.
Correspondingly, determining that needing balanced single battery is voltage change ratio difference at least one described single battery After the balanced single battery for opening threshold value, the method also includes:
When the battery pack is in charging process, it is small to control voltage change ratio in the single battery for needing equilibrium It charges in the single battery of the average value, and controls voltage change ratio in the single battery for needing equilibrium and be greater than described put down The single battery of mean value discharges;
When the battery pack is in discharge process, it is small to control voltage change ratio in the single battery for needing equilibrium It discharges in the single battery of the average value, and controls voltage change ratio in the single battery for needing equilibrium and be greater than described put down The single battery of mean value charges.
Specifically, in the feelings that reference voltage change rate is the average value of the voltage change ratio of each single battery in battery pack Under condition, the voltage change ratio of single battery each in battery pack can be made the difference with reference voltage change rate, and then judge battery Whether each single battery is to need balanced single battery in group.Such embodiment is a kind of mode of batch judgement, energy Disposably judge whether each single battery is to need balanced single battery in battery pack.
It is right in the case where reference voltage change rate is the average value of the voltage change ratio of each single battery in battery pack Needing balanced single battery to carry out balanced process is:
In view of voltage change ratio is big, on the one hand may as the internal resistance of cell it is big caused by.It on the other hand may be presence Caused by capacity volume variance, that is, SOC initial difference.Wherein, the big battery of internal resistance, aging is serious, during the charging process, on voltage It rises fastly, during discharge, voltage decline is fast, therefore, when battery pack is in charging process, to the monomer that needs are balanced The single battery that voltage change ratio is less than voltage change ratio average value in battery charges, and electric in balanced single battery to needing The single battery that buckling rate is greater than voltage change ratio average value discharges;Similarly, when battery pack is in discharge process, to need The single battery that voltage change ratio is less than voltage change ratio average value in the single battery of equilibrium is wanted to discharge, and balanced to needs The single battery that voltage change ratio is greater than voltage change ratio average value in single battery charges.
Optionally, in conjunction with the above various embodiments, the method also includes:
According to the voltage change ratio and the reference voltage change rate for needing balanced single battery, determine described in Need the target equilibrium duration of balanced single battery;
According to the target equilibrium duration for needing balanced single battery, the single battery for needing equilibrium is controlled It is balanced.
After determining the single battery for needing equilibrium, when can also determine the target equilibrium for needing balanced single battery It is long, it is balanced to needing balanced single battery to carry out then according to identified target equilibrium duration.Wherein, when target equilibrium Long determination is that the voltage change ratio of balanced single battery as needed and reference voltage change rate determine.
Optionally, according to the voltage change ratio of single battery to be equalized and reference voltage change rate, monomer to be equalized is determined The target equilibrium duration of battery, comprising:
The smallest single battery of difference of voltage change ratio in the battery pack and the reference voltage change rate is determined as Reference battery;
When the initial end voltage of the initial end voltage of the single battery to be equalized and the reference battery is not identical, root According to the initial end voltage of the single battery to be equalized and the initial end voltage of the reference battery, when determining the target equilibrium It is long;
When the initial end voltage of the single battery to be equalized is identical as the initial end voltage of the reference battery, according to The most terminal voltage of the single battery to be equalized and the most terminal voltage of the reference battery, when determining the target equilibrium It is long.
Wherein, according to the initial end voltage of the initial end voltage of the single battery to be equalized and the reference battery, really The fixed target equilibrium duration, comprising:
According to the open-circuit voltage OCV- remaining capacity SOC of the initial terminal voltage value of the reference battery and the reference battery Curve determines the first SOC value corresponding with the initial terminal voltage value of the reference battery;
According to the initial terminal voltage value of the single battery to be equalized and the corresponding OCV-SOC of the single battery to be equalized Curve determines second SOC value corresponding with the initial terminal voltage value of the single battery to be equalized;
According to first SOC value and second SOC value, the target equilibrium duration is determined.
Similarly, according to the most terminal voltage of the most terminal voltage of the single battery to be equalized and the reference battery, really The fixed target equilibrium duration, comprising:
According to the final terminal voltage value of the reference battery and the OCV-SOC curve of the reference battery, it is determining with it is described The corresponding third SOC value of the final terminal voltage value of reference battery;
According to the final terminal voltage value of the single battery to be equalized and the corresponding OCV-SOC of the single battery to be equalized Curve determines 4th SOC value corresponding with the final terminal voltage value of the single battery to be equalized;
According to the third SOC value and the 4th SOC value, when determining the target equilibrium of the single battery to be equalized It is long.
In embodiment of the disclosure, initial end voltage is the voltage detected when battery pack is just started to charge or discharged, Or the voltage of single battery that detects of detection moment in a certain setting.Most terminal voltage is on the basis of initial end voltage On, the voltage after single battery being filled with or being released default electricity.Alternatively, most terminal voltage is on the basis of initial end voltage On, to the voltage after single battery charge or discharge preset duration.
Referring to Fig. 6, Fig. 6 is that the initial end voltage of single battery to be equalized and the initial end voltage of reference battery have differences The case where.Referring to Fig. 7, Fig. 7 be single battery to be equalized initial end voltage and reference battery initial end voltage there is no poor Different situation, in the case, the voltage change ratio of single battery mainly by charge or discharge during, voltage changes speed Difference caused by.
For situation shown in fig. 6, single battery is in the different sections SOC, changes identical voltage, required to be filled with or release Electricity it is different.Therefore, the electricity difference of two section single batteries can be determined according to the initial end voltage of two section single batteries, into And according to the electricity difference of two section single batteries, determine the target equilibrium duration of single battery to be equalized.
Specifically, according to the initial terminal voltage value of the reference battery and the internal resistance value of the reference battery, determine described in The reference OCV value of reference battery;
According to described with reference to OCV value and the OCV-SOC curve of the reference battery, by described with reference to the corresponding SOC of OCV value Value is determined as first SOC value;
According to the initial terminal voltage value of the single battery to be equalized and the internal resistance value of the single battery to be equalized, determine The OCV value of the single battery to be equalized;
According to the OCV-SOC curve of the single battery to be equalized, determine that the OCV value of the single battery to be equalized is corresponding SOC value be second SOC value;
According to Δ Q=Δ SOC × CnDetermine that electricity is poor, wherein Δ Q is that the electricity is poor, and Δ SOC is the first SOC SOC difference between value and second SOC value, CnFor the active volume of the single battery to be equalized;
The target equilibrium duration is determined according to t=Δ Q/I, wherein t is the target equilibrium duration, and I is described to equal The euqalizing current of weighing apparatus single battery.
It, can be according to the most terminal voltage of single battery to be equalized and the most terminal of reference battery for situation shown in Fig. 7 Voltage determines the target equilibrium duration of single battery to be equalized.
Specifically, according to the final terminal voltage value of the reference battery and the internal resistance value of the reference battery, determine described in The reference OCV value of reference battery;
According to described with reference to OCV value and the OCV-SOC curve of the reference battery, by described with reference to the corresponding SOC of OCV value Value is determined as the third SOC value;
According to the final terminal voltage value of the single battery to be equalized and the internal resistance value of the single battery to be equalized, determine The OCV value of the single battery to be equalized;
According to the OCV-SOC curve of the single battery to be equalized, determine that the OCV value of the single battery to be equalized is corresponding SOC value be the 4th SOC value.
According to Δ Q=Δ SOC × CnDetermine that electricity is poor, wherein Δ Q is that the electricity is poor, and Δ SOC is the 3rd SOC SOC difference between value and the 4th SOC value, CnFor the active volume of the single battery to be equalized;
The target equilibrium duration is determined according to t=Δ Q/I, wherein t is the target equilibrium duration, and I is described to equal The euqalizing current of weighing apparatus single battery.
In one embodiment of the present disclosure, OCV-SOC curve is got by measurement.For example, for a certain list Body battery at interval of certain SOC value, then measures one-shot battery during variation between its SOC value is from 0 to 100% Open-circuit voltage OCV, the OCV for then answering each pair of point and SOC are corresponded, and form the SOC-OCV curve of the single battery.Figure 8 be the schematic diagram of the OCV-SOC curve of single battery.Wherein, OCV is open-circuit voltage (Open Circuit Voltage), SOC For remaining capacity (State of Charge).
OCV value is the open-circuit voltage values of single battery, different from load voltage values.Referring to Fig. 9 and formula (1), work as battery pack When in discharge condition or charged state, using internal resistance of cell model, single battery is equivalent to ideal voltage source and resistance R goes here and there Connection.Then for a single battery, the voltage value V for the single battery that sampling can be obtained according to formula (1)L(i.e. load voltage values) Be converted to open-circuit voltage values:
OCV=VL+I×R (1)
Wherein, VLTo acquire in the period, the collected load voltage values of acquisition module;I is acquisition module in the acquisition period Collected discharge current or charging current;R is the internal resistance value of single battery.
It should be understood that can first acquire the load voltage of single battery when measurement open-circuit voltage OCV, then turned according to formula (1) It is changed to corresponding open-circuit voltage OCV.
Alternatively, in another embodiment, stops working in single battery to be equalized and reach stable state or battery is rigid The collected voltage of the moment institute inherently open-circuit voltage of start-up operation or can approximation regard open-circuit voltage as, therefore in the feelings The OCV value of single battery to be equalized can be directly collected under condition.
Alternatively, in another embodiment, just having started stopping working to reference battery and reaching stable state or battery The collected voltage of the moment institute inherently open-circuit voltage of work or can approximation regard open-circuit voltage as, therefore in this case The OCV value of reference battery can directly be collected.
As a result, can according to reference voltage value, the internal resistance value of reference battery and the corresponding OCV-SOC curve of reference battery, Get above-mentioned first SOC value, the second SOC value, third SOC value, the 4th SOC value.
After obtaining the first SOC value and the second SOC value, following steps are executed:
According to Δ Q=Δ SOC × CnDetermine that electricity is poor, wherein Δ Q is that electricity is poor, and Δ SOC is the first SOC value and second SOC difference between SOC value, CnFor the active volume of single battery to be equalized;
Target equilibrium duration is determined according to t=Δ Q/I, wherein t is target equilibrium duration, and I is single battery to be equalized Euqalizing current.
Similarly, after obtaining third SOC value and the 4th SOC value, following steps are executed:
According to Δ Q=Δ SOC × CnDetermine that electricity is poor, wherein Δ Q is that electricity is poor, and Δ SOC is third SOC value and the 4th SOC difference between SOC value, CnFor the active volume of single battery to be equalized;
Target equilibrium duration is determined according to t=Δ Q/I, wherein t is target equilibrium duration, and I is single battery to be equalized Euqalizing current.
It should be understood that then continuation is according at least one monomer electricity in battery pack if it is determined that not needing balanced single battery The voltage change ratio in pond judges whether the single battery of equilibrium in need.Balanced single battery is carried out without needs when determining When, control module can be without movement, so that the corresponding balance module of any battery is not turned on.
It is the schematic diagram of the balance module of one embodiment of the disclosure referring to Figure 10.Single battery to be equalized is controlled to carry out Weighing apparatus needs that above-mentioned balanced judgement is combined to carry out.The step of being judged according to equilibrium, determines that the balanced way of single battery to be equalized is Passive equilibrium (discharging single battery to be equalized) or active equalization (fill single battery to be equalized Electricity), and corresponding balance module is connected.
Referring to Figure 10, for passive balanced, balance module includes: a resistance 811, the corresponding equilibrium of each single battery Module, i.e., the both ends of an every section single battery resistance in parallel.
For needing to carry out passive balanced single battery to be equalized, control module controls the single battery to be equalized and its Shunt circuit conducting between corresponding resistance, to execute the passive equilibrium to the single battery.Referring to Figure 10, control module is logical The conducting of control switch module 812 is crossed, realizes the conducting of the shunt circuit between the corresponding resistance of single battery to be equalized.
Resistance 811 can be fixed value resistance or variable resistance.In one embodiment, resistance 811 can be positive temperature coefficient Thermistor, can variation with temperature and change, the euqalizing current generated when thus adjustable balanced, and then automatically adjust electricity The calorific value of the equal balance system in pond, and finally control effectively to the temperature of battery equalization system.
Referring to Figure 10, for active equalization, balance module includes in parallel with each of battery pack single battery 95 Charging paths 94, charging paths 94 and single battery 95 correspond, and each charging paths 94 are all connected to generator 92, Generator 92 is connect with engine 91 by gear mechanism.
For needing to carry out the single battery to be equalized of active equalization, control module control and the single battery pair to be equalized The charging paths 94 answered are connected.When engine 91 rotates, then generator 92 is driven to generate electricity, thus by 92 electricity amount of generator It is conveyed to single battery to be equalized, increases the electricity of the single battery to be equalized.
Referring to Figure 10, when generator 92 is alternating current generator, balance module further includes and the concatenated rectification of generator 92 Device 93, each charging paths 130 are connected the rectifier 132.Turned by the alternating current that rectifier 93 issues generator 92 After being changed to direct current, generator 92 can be made to can be used in charging to single battery to be equalized.
Referring to Figure 10, control module can by controlling the conducting of corresponding with single battery to be equalized switch 96 so that this to The corresponding charging paths conducting of balanced single battery, executes the active equalization to single battery to be equalized.
In further embodiments, in addition to shown in Fig. 10, charged using generator to single battery outside, can also lead to The starting battery crossed in vehicle is that single battery to be equalized charges.
It in another embodiment,, can also will be to be equalized outside parallel resistance and single battery to be equalized in addition to shown in Fig. 10 Single battery is in parallel with the starting battery of vehicle, the electricity that single battery to be equalized is released is filled with starting battery, realization is treated It is effectively avoided energy waste while the equilibrium of balanced single battery.
As described above, in embodiment of the disclosure, multiple single batteries can share a balance module, when one shared When having at least two section single batteries to need balanced in the more piece single battery of balance module, the balance module is balanced with needs extremely Every section single battery in few two section single batteries alternately connects, and carries out respectively balanced.
Correspondingly, the embodiment of the present disclosure also provides a kind of vehicle, including above-mentioned battery equalization system.
Correspondingly, the embodiment of the present disclosure also provides a kind of computer readable storage medium, it is stored thereon with computer program Instruction, the program instruction realize above-mentioned battery equalization method when being executed by processor.
Correspondingly, the embodiment of the present disclosure also provides a kind of electronic equipment, comprising: aforementioned computer readable storage medium storing program for executing;With And one or more processor, for executing the program in the computer readable storage medium.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the disclosure to it is various can No further explanation will be given for the combination of energy.

Claims (24)

1. a kind of battery equalization method characterized by comprising
Obtain the voltage change ratio of each single battery in battery pack;
According to the voltage change ratio of single battery each in the battery pack, reference voltage variation needed for determining balanced judgement Rate;
According to the voltage change ratio of at least one single battery and the reference voltage change rate, determines and need balanced monomer electricity Pond.
2. the method according to claim 1, wherein the voltage change ratio according at least one single battery With the reference voltage change rate, determines and needs balanced single battery, comprising:
Determine the voltage change ratio between the voltage change ratio and the reference voltage change rate of at least one single battery Difference;
Obtain balanced unlatching threshold value;
Voltage change ratio difference at least one described single battery is greater than or equal to the balanced monomer electricity for opening threshold value Pond is determined as needing balanced single battery.
3. according to the method described in claim 2, it is characterized in that, the electricity according to single battery each in the battery pack Buckling rate, reference voltage change rate needed for determining balanced judgement, comprising:
Minimum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage change rate;
Voltage between the voltage change ratio of at least one single battery described in the determination and the reference voltage change rate becomes Rate difference, comprising:
Determine the voltage change ratio difference between the voltage change ratio of following single battery and the reference voltage change rate:
The maximum single battery of voltage change ratio in the battery pack;Or
Other monomers battery in the battery pack in addition to voltage change ratio is the single battery of the minimum value.
4. according to the method described in claim 3, it is characterized in that, will voltage change ratio at least one described single battery Difference is greater than or equal to the balanced single battery for opening threshold value and is determined as after needing balanced single battery, the method Further include:
When the battery pack is in charging process, controls voltage change ratio difference at least one described single battery and be greater than Or equal to the balanced single battery electric discharge for opening threshold value;
When the battery pack is in discharge process, controls voltage change ratio difference at least one described single battery and be greater than Or equal to the balanced single battery charging for opening threshold value.
5. according to the method described in claim 2, it is characterized in that, the electricity according to single battery each in the battery pack Buckling rate, reference voltage change rate needed for determining balanced judgement, comprising:
Maximum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage change rate;
Voltage between the voltage change ratio of at least one single battery described in the determination and the reference voltage change rate becomes Rate difference, comprising:
Determine the voltage change ratio difference between the voltage change ratio of following single battery and the reference voltage change rate:
The smallest single battery of voltage change ratio in the battery pack;Or
Other monomers battery in the battery pack in addition to voltage change ratio is the single battery of the maximum value.
6. according to the method described in claim 5, it is characterized in that, will voltage change ratio at least one described single battery Difference is greater than or equal to the balanced single battery for opening threshold value and is determined as after needing balanced single battery, the method Further include:
When the battery pack is in charging process, controls voltage change ratio difference at least one described single battery and be greater than Or equal to the balanced single battery charging for opening threshold value;
When the battery pack is in discharge process, controls voltage change ratio difference at least one described single battery and be greater than Or equal to the balanced single battery electric discharge for opening threshold value.
7. according to the method described in claim 2, it is characterized in that, the electricity according to single battery each in the battery pack Buckling rate, reference voltage change rate needed for determining balanced judgement, comprising:
The average value of the voltage change ratio of single battery each in the battery pack is determined as the reference voltage change rate;
Voltage between the voltage change ratio of at least one single battery described in the determination and the reference voltage change rate becomes Rate difference, comprising:
Determine that the voltage in the battery pack between the voltage change ratio of each single battery and the reference voltage change rate becomes Rate difference.
8. the method according to the description of claim 7 is characterized in that the voltage change ratio at least one single battery by described in Difference is greater than or equal to the balanced single battery for opening threshold value and is determined as after needing balanced single battery, the method Further include:
When the battery pack is in charging process, controls voltage change ratio in the single battery for needing equilibrium and be less than institute The single battery charging of average value is stated, and controls voltage change ratio in the single battery for needing equilibrium and is greater than the average value Single battery electric discharge;
When the battery pack is in discharge process, controls voltage change ratio in the single battery for needing equilibrium and be less than institute The single battery electric discharge of average value is stated, and controls voltage change ratio in the single battery for needing equilibrium and is greater than the average value Single battery charging.
9. the method according to claim 1, wherein in the voltage change according at least one single battery Rate and the reference voltage change rate, after determining the single battery for needing equilibrium, the method also includes:
According to the voltage change ratio and the reference voltage change rate for needing balanced single battery, the needs are determined The target equilibrium duration of balanced single battery;
According to the target equilibrium duration for needing balanced single battery, the equal of the single battery for needing equilibrium is controlled Weighing apparatus.
10. the method according to claim 1, wherein the voltage for obtaining each single battery in battery pack Change rate, comprising:
Unit quantity of electricity is filled with or released to each single battery in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the load electricity of the single battery The variable quantity that pressure value is generated with unit quantity of electricity described in electric quantity change.
11. the method according to claim 1, wherein the voltage for obtaining each single battery in battery pack Change rate, comprising:
To single battery charge or discharge unit time each in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the voltage value of the single battery With the variable quantity generated to unit time described in the single battery charge/discharge.
12. a kind of battery equalization system characterized by comprising balance module, acquisition module and control module,
The acquisition module is used to obtain the voltage change ratio of each single battery in battery pack;
The control module is used for the voltage change ratio according to single battery each in the battery pack, determines needed for balanced judgement Reference voltage change rate, and, according to the voltage change ratio of at least one single battery and the reference voltage change rate, really It is fixed to need balanced single battery;
The balance module is used to need balanced single battery to carry out equilibrium to described.
13. battery equalization system according to claim 12, which is characterized in that the control module is used for:
Determine the voltage change ratio between the voltage change ratio and the reference voltage change rate of at least one single battery Difference;
Obtain balanced unlatching threshold value;
Voltage change ratio difference at least one described single battery is greater than or equal to the balanced monomer electricity for opening threshold value Pond is determined as needing balanced single battery.
14. battery equalization system according to claim 13, which is characterized in that the control module is used for:
Minimum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage change rate; Or
Maximum value in the voltage change ratio of single battery each in the battery pack is determined as the reference voltage change rate; Or
The average value of the voltage change ratio of single battery each in the battery pack is determined as the reference voltage change rate.
15. battery equalization system according to claim 12, which is characterized in that the control module is used for:
According to the voltage change ratio and the reference voltage change rate for needing balanced single battery, the needs are determined The target equilibrium duration of balanced single battery;
The balance module is used for:
According to the target equilibrium duration for needing balanced single battery, need balanced single battery progress equal to described Weighing apparatus.
16. battery equalization system according to claim 12, which is characterized in that the control module is used for:
Unit quantity of electricity is filled with or released to each single battery in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the load electricity of the single battery The variable quantity that pressure value is generated with unit quantity of electricity described in electric quantity change.
17. battery equalization system according to claim 12, which is characterized in that the control module is used for:
To single battery charge or discharge unit time each in the battery pack;
To each single battery in the battery pack, determine that the voltage variety of the single battery is the voltage value of the single battery With the variable quantity generated to unit time described in the single battery charge/discharge.
18. battery equalization system according to claim 12, which is characterized in that the control module by channel with Acquisition module corresponding to same single battery is connected with balance module, and the control module is used in the determining and control module When the single battery of connection does not need to carry out equilibrium, controls the control module and connected with corresponding sampling module;Alternatively,
The control module is also used to when the single battery determined with the control module connects needs progress balanced, described in control Control module is connected in first time with corresponding sampling module, is connected in the second time with corresponding balance module.
19. battery equalization system according to claim 18, which is characterized in that the control module includes control chip, The control chip is by a pin and one channel and corresponding to the acquisition module and equilibrium model of same single battery Block connection.
20. battery equalization system according to claim 12, which is characterized in that the control module passes through two channels point It is not connect with the acquisition module and balance module for corresponding to same single battery.
21. battery equalization system according to claim 20, which is characterized in that the control module includes control chip, The control chip is connect with the acquisition module and balance module for corresponding to same single battery respectively by two pins, described Two pins and described two channels correspond.
22. a kind of computer readable storage medium, is stored thereon with computer program instructions, which is characterized in that the program instruction Claim 1-11 described in any item methods are realized when being executed by processor.
23. a kind of electronic equipment characterized by comprising
Computer readable storage medium described in claim 22;And
One or more processor, for executing the program in the computer readable storage medium.
24. a kind of vehicle, which is characterized in that the vehicle includes: battery pack and the described in any item electricity of claim 12-21 The equal balance system in pond.
CN201710773468.8A 2017-08-31 2017-08-31 Battery equalization method, system, vehicle, storage medium and electronic equipment Pending CN109435768A (en)

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